aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

September Morn Update

Browse source
This commit is contained in:
Ingy döt Net 2019-09-12 10:33:56 -07:00
parent 4e2d22a71d
commit aac6731f2c
6856 changed files with 141342 additions and 21127 deletions
Download patch file Download diff file Expand all files Collapse all files

34
Task/Queue-Usage/REXX/queue-usage.rexx
View file

@ -1,20 +1,22 @@
/*REXX program demonstrates three queue operations: push, pop, empty. */
/*REXX program demonstrates four queueing operations: push, pop, empty, query. */
say '══════════════════════════════════ Pushing five values to the stack.'
do j=1 for 4 /*loop to PUSH four values. */
call push j*10 /*PUSH (aka enqueue to stack). */
say 'pushed value:' j*10 /*echo the pushed value. */
if j\==3 then iterate /*also, insert a "null" entry. */
call push /*PUSH (aka enqueue to stack). */
say 'pushed a "null" value.' /*echo what was pushed. */
do j=1 for 4 /*a DO loop to PUSH four values. */
call push j * 10 /*PUSH (aka: enqueue to the stack).*/
say 'pushed value:' j * 10 /*echo the pushed value. */
if j\==3 then iterate /*Not equal 3? Then use a new number.*/
call push /*PUSH (aka: enqueue to the stack).*/
say 'pushed a "null" value.' /*echo what was pushed to the stack. */
end /*j*/
say '══════════════════════════════════ Quering the stack (number of entries).'
say queued() ' entries in the stack.'
say '══════════════════════════════════ Popping all values from the stack.'
do m=1 while \empty() /*EMPTY (returns TRUE if empty). */
call pop /*POP (aka dequeue from stack).*/
say m': popped value=' result /*echo the popped value. */
end /*m*/
do k=1 while \empty() /*EMPTY (returns TRUE [1] if empty).*/
call pop /*POP (aka: dequeue from the stack).*/
say k': popped value=' result /*echo the popped value. */
end /*k*/
say '══════════════════════════════════ The stack is now empty.'
exit /*stick a fork in it, we're done.*/
/*──────────────────────────────────subroutines/functions/operators. */
push: queue arg(1); return /*REXX QUEUE is FIFO. */
pop: procedure; pull x; return x /*REXX PULL removes a stack item*/
empty: return queued()==0 /*returns the status of the stack*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
push: queue arg(1); return /*(The REXX QUEUE is FIFO.) */
pop: procedure; parse pull x; return x /*REXX PULL removes a stack item. */
empty: return queued()==0 /*returns the status of the stack. */